| 1 | The refractory layer is refractory bricks. | |
| 2 | The inside is lined with bricks. | |
| 3 | This can be achieved by means of firebricks. | |
| 4 | If you use firebricks round the walls of the boiler, the heat loss. Can be considerably reduced. | |
| 5 | The heat loss can be considerably reduced by the use of firebricks round the walls of the boiler. |
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